SOME OE THE ANIMALS EED AND SLAUGHTEEED AS HUMAN FOOD. 501 
also dried and re-weighed. The hygroscopic water, the fat, and the matters insoluble 
in ether, were thus all estimated upon the same weighed quantity of crude dry sub- 
stance. A very good control was therefore obtained of the accuracy of the fat determi- 
nations. Moreover, two or more analyses were always made of each specimen. The 
results of these Fat determinations will be found tabulated in detail in the Appendix 
(Table XIII. p. 692). 
6th. Determination of the 'Nitrogen. 
The nitrogen was determined by burning with soda-lime, and collecting and weighing 
as the double chloride of platinum and ammonium, in the usual way. The crude dry 
matters in which the nitrogen was determined, were, for the most part, as under*; 
(a) Mixed Carcass parts, without bones. 
(b) Mixed Carcass Bones. 
(c) Mixed Offal parts, including bones, if any. 
(cl) Hair or Wool. 
(e) Mixed parts of the Entire Animal, excluding hair or wool. 
It will be obvious, that, owing to the heterogeneous character of these mixed speci- 
mens, very great care was requisite, both in the preparation of the mixtures themselves 
and in taking the weighed quantities for analysis. Duplicate nitrogen determinations 
were always made, and the individual results are given in the Appendix (Table XIV. 
7th. Constituents of the Ash determined. 
The substances determined under this head were 
{a) Phosphoric acid. 
{h) Potash and Soda. 
(c) Lime and Magnesia. 
(d) Matter insoluble in acid. 
As the results of the analyses of the animal-ashes must form the subject of a separate 
aper, the description of the methods adopted need not be given here. 
The experimental results obtained by the methods above described are given for 
re erence, in full detail, in the Appendix. The discussion, seriatim, of the voluminous 
data thus provided, would tend rather to embarrass than to facilitate the perception of 
whih parts, upon 
mixed ^ncluded all the bones, excepting those of the head and feet ; a separate 
brains which iTu ^ ^ ^ including both soft and bony parts, excepting the tongue and 
The mixed sam 1 samples prepared for nitrogen determinations, 
the other animals^^ ^ therefore contain bone, as did those in tlie eases of 
MDCCCLIX. 
3 u 
